[NTG-context] Clipping headers

Hello, How can I clip long markings in the header? See this MNWE, where the two copies of section title collide on page 3. --------------- \starttext \setupbodyfont[20pt] \setupheadertexts[section][section] \section{One} \section{Two} \page \section{Three} \page \section{Long Title for Section Four} \page \section{Five} \stoptext ------------ How can I clip the title to a fixed length (5cm?) and perhaps add "..." at the end for longer titles? Is it possible to provide an alternative shorter section title within \section? Thanks, Mohammad